The outer layer of an artery or vein is composed of:
A) cartilage. B) connective tissue. C) smooth muscle. D) epithelium.
Answer: B
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Explain how the nervous system and hormones regulate the secretion of gastric juice. What will be an ideal response?
Which wavelengths are absorbed by the ozone layer high in the atmosphere?
a. visible wavelengths of electromagnetic radiation b. longer wavelengths of electromagnetic radiation c. any wavelength of electromagnetic radiation d. shorter wavelengths of electromagnetic radiation
Nondisjunction in somatic cells can result in aneuploid cells. This may give rise to:
A) cancer. B) cri-du-chat syndrome. C) Down syndrome. D) Turner syndrome. E) Klinefelter syndrome.
The thing that distinguishes one element, such as chlorine, from another, such as neon, is the number of:
A) protons in the nucleus. B) protons and neutrons in the nucleus. C) electrons. D) protons, neutrons, and electrons. E) neutrons in the nucleus.